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Luas persegi panjang = p x l
Luas = 24 x 15 = 360
Luas segitiga = 1/2 a x t
Luas = 1/2 x (15 + 6 + 6) x t
Luas = 1/2 x 27 x t (tingginya kita tidak tahu ya)
Kalau misalnya t = (a - 24), jawabanmu sudah benar seharusnya :)
Luas total = 360 + (27/2 x t)